Bottle preform arranging and fixed-distance conveying device of bottle blowing machine

Abstract

The utility model discloses a bottle blowing machine bottle preform arranging and fixed-distance conveying device which comprises a variable-distance base, a longitudinal sliding seat is longitudinally installed on the variable-distance base in a reciprocating sliding mode, a variable-distance screw extending longitudinally is further rotatably installed on the variable-distance base, a bottle preform clamping device for fixing or loosening a bottle preform is installed on the longitudinal sliding seat, and the variable-distance screw is connected with the longitudinal sliding seat. The bottle preform clamping device is provided with a protruding block clamped into a thread groove of the variable-pitch screw, the variable-pitch screw is driven to rotate through a rotation driving device, and threads of the variable-pitch screw are divided into an initial part with the minimum thread pitch, a transition part with the gradually-increased thread pitch and a fixed-distance part with the maximum thread pitch and the fixed distance. According to the device, the distance between the clamped bottle blanks can be automatically changed through rotation of the variable-pitch screw, it is guaranteed that the distance is accurately controlled, driving is stable, and the conveying efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of bottle preform conveying technology, and in particular to a bottle preform sorting and conveying device for blow molding machines. Background Technology

[0002] Heating energy consumption in blow molding machines is the largest part of the entire production line. Traditional blow molding machines do not have a variable pitch device, and the spacing between the preform holders and the spacing between the mold cavities are equal, which greatly reduces the heat utilization rate of the heating lamps. By using a variable pitch mechanism for preforms in blow molding machines, the spacing between preforms during heating is reduced to the spacing between the mold cavities. In the same length of lamp area, the number of preforms heated increases several times compared to traditional blow molding machines without a variable pitch mechanism, significantly improving the heat utilization rate of the lamps and achieving energy saving.

[0003] The existing preform pitch changing mechanism in blow molding machines consists of several push rods with guide heads, connected by chains of predetermined lengths. The last push rod at the very end is connected to a cylinder piston rod. During pitch changing, the cylinder drives the last push rod, which pulls the chain. Once the chain is taut, it pulls the next push rod, which in turn pushes the chain, tautening it again, and so on. This structure requires a cylinder with a very large stroke to complete the above actions. Furthermore, the pitch changes of several preforms are not synchronized, with a time difference between them. The time difference between the first and last preforms is the largest, which can cause the heated preforms to stick together, resulting in uneven movement and an increased scrap rate. The preform slides, and the guide head at the lower end of the push rod needs to move down and insert into the preform opening so that the preform can slide on the guide rail to change pitch. After the pitch is changed, it needs to move up and separate from the preform opening. Therefore, the push rod moves up and down by a cylinder driving the entire preform pitch changing mechanism of the blow molding machine to move up and down. The action response is slow and the efficiency is low.

[0004] The disadvantages of the above-mentioned preform pitch variable mechanism in blow molding machines are: the time difference in preform pitch variable can cause the heated preforms to stick together, resulting in uneven movement, increased waste, and time-consuming insertion of the push rod guide head into the bottle neck, leading to low efficiency. Utility Model Content

[0005] The technical problem to be solved by this utility model is: a preform feeding and conveying device for blow molding machines, which can automatically change the distance between the preforms being held by rotating a variable pitch screw, ensuring accurate spacing control and stable driving, and improving conveying efficiency.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is: a preform feeding and conveying device for a blow molding machine, comprising a variable pitch base, a longitudinal slide block slidably mounted on the variable pitch base, a longitudinally extending variable pitch screw rotatably mounted on the variable pitch base, a preform clamping device for fixing or releasing the preform mounted on the longitudinal slide block, a protrusion that engages with the thread groove of the variable pitch screw on the preform clamping device, the variable pitch screw being driven to rotate by a rotation drive device, and the thread of the variable pitch screw being divided into an initial part with the smallest pitch, a transition part with a gradually increasing pitch, and a fixed-distance part with the largest pitch.

[0007] As a preferred embodiment, the preform clamping device includes multiple clamping movable plates that are fixed on a longitudinal slide and slide synchronously. Each clamping movable plate is fixedly mounted with a clamping seat. A clamping claw is deflected and mounted on the clamping seat. The end of the clamping claw is provided with a clamping arc groove for clamping the preform mouth. The clamping seat is provided with an adjustment structure for adjusting the clamping claw to clamp different sizes of bottle mouths and an elastic reset structure for elastically resetting the clamping claw to clamp the bottle mouth. The variable pitch base is provided with a claw opening device for opening the clamping claw.

[0008] As a preferred embodiment, the clamping seat has a hinged clamping claw and a receiving groove for accommodating the tilting of the clamping claw's tail. The elastic reset structure includes a middle stop block, which is fixedly installed in the receiving groove and located in the middle of the clamping claw. The middle stop block has reset springs on both sides that engage with the tail of the clamping claw and cooperate to maintain the clamping state. The adjustment structure is an adjustment limit block, which is installed on the side wall of the receiving groove and corresponds to the two sides of the clamping claw. The adjustment limit block is fixedly installed in the receiving groove by screws passing through the clamping seat.

[0009] As a preferred embodiment, the opening claw device includes an opening claw support frame fixedly mounted on a variable pitch base and located on both sides of the clamping claw. A swing rod that swings about the longitudinal axis is hinged to the opening claw support frame. A pressing shaft is provided at the end of the swing rod near the clamping claw to press down and open one side of the clamping claw. A swing drive device for driving up and down swinging is connected at the end of the swing rod away from the clamping claw. The longitudinal extension of the pressing shaft corresponds to the length of the longitudinal slide. A pressing block that cooperates with the pressing shaft is provided on the clamping claw.

[0010] As a preferred embodiment, the swing drive device includes a drive cylinder, which is hinged to the opening claw support frame. The piston rod of the drive cylinder is hinged to the swing rod at the end away from the clamping claw. The variable pitch base is provided with auxiliary brackets at both ends. The hinge on the opening claw support frame is rotatably mounted on the auxiliary bracket along the extended hinge axis. The hinge axis is fixedly connected to the lower pressure shaft through a connecting plate.

[0011] As a preferred embodiment, both the lower pressure block and the protrusion are movable rotating rollers, and the lower pressure block is rotatably mounted on the side wall of the clamping claw by rotating bolts and nuts and rotating bearings.

[0012] As a preferred embodiment, the clamping claw is further provided with an auxiliary clamping claw, the top of the clamping claw is provided with a mounting groove for screw mounting of the auxiliary clamping claw, and the auxiliary clamping claw is also provided with an auxiliary arc-shaped groove adapted to the bottle mouth end of the preform.

[0013] As a preferred embodiment, the clamping claw includes a deflection rod portion and a clamping block portion. The clamping arc-shaped groove is provided on the clamping block portion. The clamping block portion is fixedly mounted on the deflection rod portion by screws. The clamping block portion is provided with a snap-fit ​​notch for easy engagement with the deflection rod portion.

[0014] After adopting the above technical solution, the effect of this utility model is as follows: The preform feeding and conveying device for a blow molding machine includes a variable pitch base. A longitudinal slide is longitudinally reciprocatingly mounted on the variable pitch base. A longitudinally extending variable pitch screw is also rotatably mounted on the variable pitch base. A preform clamping device for fixing or releasing the preform is mounted on the longitudinal slide. The preform clamping device is provided with a protrusion that engages with the threaded groove of the variable pitch screw. The variable pitch screw is driven to rotate by a rotation drive device. The thread of the variable pitch screw is divided into an initial part with the smallest pitch, a transition part with a gradually increasing pitch, and a fixed-pitch part with the largest and most fixed pitch. First, the preforms are sequentially fed through the preform clamping device. After the holding device clamps and fixes the preforms, the drive device rotates to drive the variable pitch screw to rotate. The threaded groove rotates accordingly, squeezing the protrusion. Then, the protrusion drives the preform clamping device to move. The longitudinal slide limits the sliding direction, allowing the preform clamping device to move longitudinally. The preform clamping device on the initial part moves to the fixed distance part through the transition plate in sequence. This ensures that the preforms are clamped at the same distance. Then, the preform clamping device opens to remove the preforms at equal intervals for subsequent heating and softening, preventing adhesion. This device can automatically change the distance between the clamped preforms by rotating the variable pitch screw, ensuring accurate spacing control and stable drive, and improving conveying efficiency.

[0015] Furthermore, the preform clamping device includes multiple clamping moving plates that are fixed on a longitudinal slide and slide synchronously. Each clamping moving plate is fixedly mounted with a clamping seat. A clamping claw is deflected and mounted on the clamping seat. The end of the clamping claw is provided with a clamping arc-shaped groove for clamping the preform's mouth. The clamping seat is provided with an adjustment structure for adjusting the clamping claw to clamp different sizes of bottle mouths and an elastic reset structure for elastically resetting the clamping claw to clamp the bottle mouth. The variable pitch base is provided with an opening claw device for opening the clamping claw. The clamping arc-shaped groove of the clamping claw can adapt to the bottle mouth of the preform, so that the preform will not fall off and it is convenient to clamp or release. Moreover, the clamping diversity can be improved by adjusting the structure for different preform sizes.

[0016] Furthermore, since the clamping seat has a hinged clamping claw and a receiving groove for accommodating the swing of the clamping claw's tail, the elastic reset structure includes a middle stop block. The middle stop block is fixedly installed in the receiving groove and located in the middle of the clamping claw. The middle stop block has reset springs on both sides that engage with the tail of the clamping claw and cooperate to maintain the clamping state. The adjustment structure is an adjustment limit block. The adjustment limit block is installed on the side wall of the receiving groove and corresponds to the two sides of the clamping claw. The adjustment limit block is fixedly installed in the receiving groove by screws passing through the clamping seat. The receiving groove allows for quick installation of the clamping claw, and the middle stop block and adjustment limit block limit the swing range of the clamping claw. The reset springs effectively ensure that the clamping claw can automatically reset and clamp after being opened, ensuring stable and firm clamping of the bottle preform.

[0017] Furthermore, the opening claw device includes an opening claw support frame fixedly installed on the variable pitch base and located on both sides of the clamping claw. A swing rod that swings about the longitudinal axis is hinged on the opening claw support frame. The swing rod has a pressing shaft at the end near the clamping claw to press down and open one side of the clamping claw. The swing rod is connected to a swing drive device that drives the swing up and down. The longitudinal extension of the pressing shaft corresponds to the length of the longitudinal slide. The clamping claw is provided with a pressing block that cooperates with the pressing shaft. The swing drive device drives the swing rod to swing, which in turn drives the pressing shaft to swing up and down. At this time, the pressing shaft can squeeze the pressing block, thereby pressing the clamping claw open and compressing the return spring. The length of the pressing shaft can ensure that the clamping claws on the longitudinal slide can contact and squeeze.

[0018] Furthermore, since the swing drive device includes a drive cylinder, which is hinged to the opening claw support frame, and the piston rod of the drive cylinder is hinged to the swing rod at the end away from the clamping claw, and auxiliary supports are provided at both ends of the variable pitch base, the hinge on the opening claw support frame is rotatably mounted on the auxiliary supports along the extended hinge axis, and the hinge axis is fixedly connected to the lower pressure shaft through a connecting plate; the extension and retraction of the piston rod of the drive cylinder can ensure that the swing rod swings stably and accurately, the hinged installation of the drive cylinder can also adapt to the movement brought about by the swing of the swing rod, and the auxiliary supports can ensure that the lower pressure block is squeezed stably and reliably when the swing rod drives the lower pressure shaft to swing, thus improving the stability of use.

[0019] Furthermore, since both the lower pressure block and the protrusion are movable rotating rollers, the lower pressure block is rotatably mounted on the side wall of the clamping claw via rotating bolts, nuts, and rotating bearings. Since both the lower pressure block and the protrusion will be squeezed and moved, the movable rotating installation can reduce the wear generated during squeezing and improve the performance.

[0020] Furthermore, since the clamping claw is also equipped with an auxiliary clamping claw, the top of the clamping claw is provided with a mounting groove for screw mounting of the auxiliary clamping claw, and the auxiliary clamping claw is also provided with an auxiliary arc-shaped groove adapted to the bottle mouth end of the preform; the bottle mouth is further stabilized during clamping, improving the stability during conveying.

[0021] Furthermore, since the clamping claw includes a deflection rod portion and a clamping block portion, the clamping arc groove is provided on the clamping block portion, the clamping block portion is fixedly installed on the deflection rod portion by screws, and the clamping block portion is provided with a snap-fit ​​notch for easy cooperation with the deflection rod portion; this facilitates the combination and assembly of the clamping claw, facilitates mass production and replacement, and improves practicality. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Figure 1 This is a perspective view of an embodiment of the present utility model;

[0024] Figure 2 This is a schematic diagram of the structure of one end of the variable pitch base rotation drive device according to an embodiment of the present invention;

[0025] Figure 3 This is a cross-sectional view of the preform clamping device in an embodiment of this utility model;

[0026] Figure 4 This is a schematic diagram of the variable pitch screw according to an embodiment of the present invention;

[0027] In the attached diagram: 1. Variable pitch base; 2. Longitudinal slide; 3. Variable pitch screw; 4. Threaded groove; 5. Protrusion; 6. Initial part; 7. Transition part; 8. Fixed distance part; 9. Drive base; 10. Drive motor; 11. Reducer; 12. Transmission belt; 13. Clamping moving plate; 14. Clamping seat; 15. Clamping claw; 151. Deflection rod part; 152. Clamping block part; 16. Clamping arc groove; 17. Receiving groove; 18. Intermediate stop block; 19. Return spring; 20. Adjustment limit block; 21. Opening claw support frame; 22. Swing rod; 23. Lower pressure shaft; 24. Lower pressure block; 25. Drive cylinder; 26. Auxiliary bracket; 27. Connecting plate; 28. Rotary bearing; 29. ​​Auxiliary claw; 30. Mounting groove; 31. Auxiliary arc groove; 32. Clamping notch. Detailed Implementation

[0028] The present invention will be further described in detail below through specific embodiments.

[0029] like Figures 1 to 4As shown, a preform feeding and conveying device for a blow molding machine includes a variable pitch base 1. A longitudinal slide 2 is longitudinally reciprocatingly mounted on the variable pitch base 1. A longitudinally extending variable pitch screw 3 is also rotatably mounted on the variable pitch base 1. A preform clamping device for fixing or releasing the preform is mounted on the longitudinal slide 2. The preform clamping device has a protrusion 5 that engages with the threaded groove 4 of the variable pitch screw 3. The variable pitch screw 3 is driven to rotate by a rotation drive device. The thread of the variable pitch screw 3 is divided into an initial part 6 with the smallest pitch, a transition part 7 with a gradually increasing pitch, and a fixed-pitch part 8 with the largest and fixed pitch. Figure 4 As described above, the initial part 6 has a relatively dense screw pitch distribution, and the bottle preforms are placed sequentially without compression. As it rotates, the screw pitch gradually increases, and the spacing between the bottle preforms increases, which facilitates the blow molding of the bottle preforms after heating and prevents them from sticking together. The spacing is automatically determined, and different bottle preform sizes can be conveyed by changing the variable pitch screw 3 with different screw pitches.

[0030] The rotation drive device includes a drive base 9 fixedly installed on one side of the variable pitch base 1. A drive motor 10 and a reducer 11 are fixedly installed on the drive base 9. The output shaft of the drive motor 10 and the variable pitch screw 3 are connected by a transmission belt 12 structure for transmission.

[0031] like Figure 1 and Figure 2 As shown, the preform clamping device includes multiple clamping moving plates 13 that are fixed on the longitudinal slide block 2 and slide synchronously. Each clamping moving plate 13 is fixedly mounted with a clamping seat 14. A clamping claw 15 is deflected and mounted on the clamping seat 14. The end of the clamping claw 15 is provided with a clamping arc-shaped groove 16 for clamping the bottle mouth of the preform. The clamping seat 14 is provided with an adjustment structure for adjusting the clamping claw 15 to clamp different sizes of bottle mouths and an elastic reset structure for elastically resetting the clamping claw 15 to clamp the bottle mouth. The variable pitch base 1 is provided with an opening claw device for opening the clamping claw 15. The clamping arc-shaped groove 16 of the clamping claw 15 can adapt to the bottle mouth of the preform, so that the preform will not fall off and it is convenient to clamp or release. In addition, the clamping diversity can be improved by adjusting the structure for different preform sizes.

[0032] like Figure 3As shown, the clamping seat 14 has a hinged clamping claw 15 and a receiving groove 17 for accommodating the tilting tail of the clamping claw 15. The elastic reset structure includes a middle stop 18, which is fixedly installed in the receiving groove 17 and located in the middle of the clamping claw 15. The middle stop 18 has reset springs 19 on both sides that engage with the tail of the clamping claw 15 and cooperate to maintain the clamping state. The adjustment structure is an adjustment limit block 20, which is installed on the side wall of the receiving groove 17 and corresponds to the two sides of the clamping claw 15. The adjustment limit block 20 is fixedly installed in the receiving groove 17 by screws passing through the clamping seat 14. The clamping claw 15 can be quickly installed through the receiving groove 17, and the hinge point of the clamping claw 15 is higher than the plane height of the receiving groove 17, which facilitates the installation of the hinge shaft. The return spring 19 is snapped between the clamping claw 15 and the intermediate stop 18, which pushes the clamping claw 15 to maintain the clamping state. At the same time, the intermediate stop 18 and the adjusting limit block 20 limit the swing range of the clamping claw 15. The return spring 19 can effectively ensure that the clamping claw 15 can automatically return to clamp after being opened, ensuring stable and firm clamping of the bottle preform. The adjusting limit block 20 can be replaced with different sizes, thereby changing the blocking range. The adjustment is simple and reliable.

[0033] like Figure 1 , Figure 3 and Figure 4 As shown, the opening claw device includes an opening claw support frame 21 fixedly installed on the variable pitch base 1 and located on both sides of the clamping claw 15. A swing rod 22 that swings about the longitudinal axis is hinged to the opening claw support frame 21. The swing rod 22 has a pressing shaft 23 at the end near the clamping claw 15 to press down and open one side of the clamping claw 15. The swing rod 22 is connected to a swing drive device that drives the swing up and down at the end away from the clamping claw 15. The longitudinal extension of the pressing shaft 23 corresponds to the length of the longitudinal slide 2. The clamping claw 15 is provided with a pressing block 24 that cooperates with the pressing shaft 23. The opening claw support frame 21 is fixedly installed on both sides of the middle of the longitudinal position of the variable pitch base 1. By driving the swing rod 22 to swing, the pressing shaft 23 can effectively press the pressing block 24, thereby pressing down and opening the clamping claw 15. The return spring 19 is compressed. The length of the pressing shaft 23 can ensure that the clamping claws 15 on the longitudinal slide 2 can contact and squeeze.

[0034] Furthermore, the swing drive device includes a drive cylinder 25, which is hinged to the opening claw support frame 21. The piston rod of the drive cylinder 25 is hinged to the swing rod 22 at the end away from the clamping claw 15. The variable pitch base 1 is provided with auxiliary brackets 26 at both ends. The hinge on the opening claw support frame 21 is rotatably mounted on the auxiliary bracket 26 along the extended hinge axis. The hinge axis is fixedly connected to the lower pressure shaft 23 through the connecting plate 27. The cylinder body of the drive cylinder 25 is hinged to the opening claw bracket, so it can swing along with the swing rod 22. The auxiliary bracket 26 can ensure that the lower pressure block 24 is squeezed stably and reliably when the swing rod 22 drives the lower pressure shaft 23 to swing, thus improving the stability of use.

[0035] In this embodiment, both the lower pressing block 24 and the protrusion 5 are movable rotating rollers. The lower pressing block 24 is rotatably mounted on the side wall of the clamping claw 15 by rotating bolts and nuts and rotating bearings 28. Similarly, the protrusion 5 is also mounted on the clamping seat 14 through the clamping moving plate 13 by bolts and nuts and rotating bearings 28. In this way, when it is squeezed and moved, the movable rotation installation can reduce the wear generated during squeezing, improve the use effect, and extend the service life.

[0036] like Figure 2 and Figure 3 As shown, the clamping claw 15 is also provided with an auxiliary clamping claw 29. The top of the clamping claw 15 is provided with a mounting groove 30 for screw mounting of the auxiliary clamping claw 29. The auxiliary clamping claw 29 is also provided with an auxiliary arc-shaped groove 31 that is adapted to the bottle mouth end of the preform. This further stabilizes the bottle mouth during clamping, facilitates the installation of the auxiliary clamping claw 29, and improves the stability during conveying.

[0037] In this embodiment, the clamping claw 15 includes a deflection rod portion 151 and a clamping block portion 152. The clamping arc-shaped groove 16 is provided on the clamping block portion 152. The clamping block portion 152 is fixedly installed on the deflection rod portion 151 by screws. The clamping block portion 152 is provided with a snap-fit ​​notch 32 to facilitate cooperation with the deflection rod portion 151. Since the bottle preforms have different bottle mouth sizes and shapes, the clamping claw 15 can be disassembled and installed to produce clamping block portions 152 with corresponding bottle mouth shapes without replacing the deflection rod portion 151, which facilitates mass production and replacement and improves practicality.

[0038] The working principle of this embodiment is as follows: First, the piston rod of the drive cylinder 25 extends, causing the swing rod 22 to drive the lower pressure shaft 23 to press down the lower pressure block 24, thus opening the clamping claw 15. Then, the bottle mouth of the preform is placed into the clamping arc groove 16 and locked in place. The piston rod of the drive cylinder 25 retracts, causing the swing rod 22 to swing upward and release the pressed lower pressure block 24. The clamping claw 15 automatically clamps the preform through the return spring 19. The auxiliary arc groove 31 of the auxiliary claw 29 also clamps the upper end of the bottle mouth. The drive motor 10 drives the transmission belt 12 through the reducer 11, which in turn drives the variable pitch screw 3 to rotate. The threaded groove 4 rotates and squeezes the protrusion 5, causing the preform held by the clamping claw 15 to start to be conveyed. It passes through the initial part 6, the transition part 7, and finally the fixed distance part 8. Then, the piston rod of the drive cylinder 25 extends to open the clamping claw 15 for subsequent operations.

[0039] The above-described embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Any modifications and alterations to the technical solution of the present utility model without departing from its design spirit shall fall within the protection scope defined by the claims of the present utility model.

Claims

1. A preform feeding and conveying device for a blow molding machine, comprising a variable-pitch base, characterized in that: A longitudinal slide block is longitudinally reciprocatingly mounted on the variable pitch base. A longitudinally extending variable pitch screw is also rotatably mounted on the variable pitch base. A preform clamping device for fixing or releasing preforms is mounted on the longitudinal slide block. The preform clamping device is provided with a protrusion that engages with the thread groove of the variable pitch screw. The variable pitch screw is driven to rotate by a rotation drive device. The thread of the variable pitch screw is divided into an initial part with the smallest pitch, a transition part with a gradually increasing pitch, and a fixed-pitch part with the largest and constant pitch.

2. The preform feeding and conveying device for a blow molding machine as described in claim 1, characterized in that: The preform clamping device includes multiple clamping moving plates that are fixed on a longitudinal slide and slide synchronously. Each clamping moving plate is fixedly mounted with a clamping seat. A clamping claw is deflected and mounted on the clamping seat. The end of the clamping claw is provided with a clamping arc groove for clamping the preform mouth. The clamping seat is provided with an adjustment structure for adjusting the clamping claw to clamp different sizes of bottle mouths and an elastic reset structure for elastically resetting the clamping claw to clamp the bottle mouth. The variable pitch base is provided with a claw opening device for opening the clamping claw.

3. The preform feeding and conveying device for a blow molding machine as described in claim 2, characterized in that: The clamping seat has a hinged clamping claw and a receiving groove for accommodating the swing of the clamping claw's tail. The elastic reset structure includes a middle stop block, which is fixedly installed in the receiving groove and located in the middle of the clamping claw. The middle stop block has reset springs on both sides that engage with the tail of the clamping claw and cooperate to maintain the clamping state. The adjustment structure is an adjustment limit block, which is installed on the side wall of the receiving groove and corresponds to the two sides of the clamping claw. The adjustment limit block is fixedly installed in the receiving groove by screws passing through the clamping seat.

4. The preform feeding and conveying device for a blow molding machine as described in claim 3, characterized in that: The opening claw device includes an opening claw support frame fixedly installed on the variable pitch base and located on both sides of the clamping claw. A swing rod that swings about the longitudinal axis is hinged to the opening claw support frame. A pressing shaft is provided at the end of the swing rod near the clamping claw to press down and open one side of the clamping claw. A swing drive device that drives the swing up and down is connected to the end of the swing rod away from the clamping claw. The longitudinal extension of the pressing shaft corresponds to the length of the longitudinal slide. A pressing block that cooperates with the pressing shaft is provided on the clamping claw.

5. The preform feeding and conveying device for a blow molding machine as described in claim 4, characterized in that: The swing drive device includes a drive cylinder, which is hinged to the opening claw support frame. The piston rod of the drive cylinder is hinged to the swing rod at the end away from the clamping claw. The variable pitch base is provided with auxiliary brackets at both ends. The hinge on the opening claw support frame is rotatably mounted on the auxiliary bracket along the extended hinge axis. The hinge axis is fixedly connected to the lower pressure shaft through a connecting plate.

6. The preform feeding and conveying device for a blow molding machine as described in claim 5, characterized in that: Both the lower pressure block and the protrusion are movable rotating rollers. The lower pressure block is rotatably mounted on the side wall of the clamping claw by rotating bolts, nuts and rotating bearings.

7. The preform feeding and conveying device for a blow molding machine as described in claim 6, characterized in that: The clamping claw is also provided with an auxiliary clamping claw. The top of the clamping claw is provided with a mounting groove for screw mounting of the auxiliary clamping claw. The auxiliary clamping claw is also provided with an auxiliary arc-shaped groove that is adapted to the bottle mouth end of the preform.

8. The preform feeding and conveying device for a blow molding machine as described in claim 7, characterized in that: The clamping claw includes a deflection rod portion and a clamping block portion. The clamping arc groove is provided on the clamping block portion. The clamping block portion is fixedly installed on the deflection rod portion by screws. The clamping block portion is provided with a snap-fit ​​notch to facilitate cooperation with the deflection rod portion.

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